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Re: bash sockets: printf \x0a does TCP fragmentation


From: Chet Ramey
Subject: Re: bash sockets: printf \x0a does TCP fragmentation
Date: Sun, 23 Sep 2018 14:26:32 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 9/22/18 4:22 PM, Bob Proulx wrote:

> Note that I *did* provide you with a way to do what you wanted to do. :-)
> 
> It was also noted in another message that the external standalone
> printf command line utility did buffer as you desired.  That seems
> another very good solution too.  Simply use "command printf ..." to
> force using the external version.

This won't work the way you want. The `command' builtin only inhibits
execution of shell functions. It still executes builtins.  You want to
either get the full pathname of a printf utility using `type -ap printf'
and use that, or use the env or exec variants I recommended in my last
message.

> 
> Anyway...  Since printf is a text oriented utility it makes sense to
> me that I would operate in line buffered output mode.

It's that bash sets stdout and stderr to be line-buffered, not anything
printf-specific.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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